If it is connected to the boat motor check the voltage that is coming from the engine and clean the battery post. This solved the screen flickering.
If you don't want to do that just call Northstar customer support and see what they suggest.
Phone (Toll-free) 1-800-628-4487 or (Direct) 603-324-2042
That will get you better support.
This website sells backlights.
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